Hacker, Informant and Party Boy of the Projects - NYTimes.com:
On the Internet he was Sabu, a notorious celebrity who led a scattered tribe of politically motivated “hacktivists,” revered as the sly mastermind of brash computer attacks. Then, when he was caught, he slipped into the role of federal informant.
But always he was Hector Xavier Monsegur, party boy of the projects.
The multiple worlds of Sabu converged on Tuesday when court papers revealed his real identity.
As an informant, he helped bring down a batch of prominent fellow hackers in Europe and the United States. They were indicted on a charge of computer crimes that the authorities said affected one million victims, along with major companies and government agencies.